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junit.framework.AssertionFailedError: Must use or extend XWalkApplication	at junit.framework.Assert.fail(Assert.java:50)	at org.xwalk.core.XWalkCoreWrapper.findSharedCore(XWalkCoreWrapper.java:146)	at org.xwalk.core.XWalkCoreWrapper.check(XWalkCoreWrapper.java:58)	at org.xwalk.core.XWalkCoreWrapper.check(XWalkCoreWrapper.java:51)	at org.xwalk.core.XWalkActivity.onStart(XWalkActivity.java:84)	at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)	at android.app.Activity.performStart(Activity.java:5241)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2197)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2273)	at android.app.ActivityThread.access$800(ActivityThread.java:138)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1236)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:149)	at android.app.ActivityThread.main(ActivityThread.java:5045)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)	at dalvik.system.NativeStart.main(Native Method)